JP2543713Y2 - sensor - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention relates to a sensor used for fire alarm equipment and the like.

(Prior Art) Conventionally, an example of this type of sensor is shown in FIG. The sensor a is composed of a body b mounted downward on a construction surface such as a ceiling, and a sensing unit f including a thermostat d and a heat-sensitive plate e mounted at a lower center of the body b.
, A terminal plate h to which a lead wire g is connected, a packing k and a packing press fitting m. Then, the sensing portion f inserted into the lower center portion of the body b is fixed to the body b with an adhesive, and the terminal plate h is fitted into the terminal plate housing recess n formed in the body b, and is driven by a driving tack s. Fixed,
After connecting the sensing portion terminal p and the terminal plate h, the storage recess n
Is filled with a filler (silicone resin), and the presser fitting m is fixed to the body b with a tapping screw t via a packing k.

(Problems to be Solved by the Invention) By the way, the conventional sensor has a large number of parts and uses an adhesive and a filler. Therefore, the process proceeds to the next step until the adhesive and the filler are cured. However, there is a problem that a considerable amount of work time is required and work efficiency is poor. Further, there is a problem that the heat sensitive plate e is deformed during transportation and storage as well as during the assembling work.

This invention was devised with a focus on the above-mentioned actual situation. The purpose of the invention is to shorten the working time and the number of parts by improving the assembling workability, and to reduce the cost. To provide a vessel.

(Means for Solving the Problems) In the present invention, the following technical measures were taken to achieve the above object.

That is, this invention is based on a body attached to a construction surface such as a ceiling material, a sensing unit attached to the lower center of the body, and a printed board connected to a lead wire and housed in a housing recess formed in the body. Detector
The storage recess has a substantially cup-like shape with an upper opening, and a surrounding wall is provided from the center of the body to one side wall. The lead wire is arranged to extend from the one side wall to the center and be drawn out of the storage recess. In addition, the terminals of the sensing section are directly connected on a printed board, and a filling made of urethane resin is injected into the storage recess, and the lead wire in the storage recess is singulated to be buried.

(Operation) According to the present invention, after inserting the terminal of the sensing unit fitted to the lower center of the body into the terminal insertion hole of the printed board, the filler is immediately injected and solidified, whereby the sensing unit and the printed board are solidified. Are electrically connected to each other and are integrally connected in the storage recess of the body, and the water honey is secured.

(Example) Hereinafter, an example of this invention is described based on a drawing.

In FIGS. 1 and 2, reference numeral 1 denotes a heat sensor, a body 2 made of synthetic resin, a printed board 3 housed in the body 2, a sensing unit 4 attached to a lower center portion of the body 2, and
Synthetic resin protector 5 and printed board embedded filler 6
And a cord tension stopper 7 and a tapping screw 8.

The body 2 has a substantially cup shape with an upper opening.
Inside, a surrounding wall 10 forming a printed board housing concave portion 9 opening upward is provided from the center portion to one side wall, and a sensing portion mounting hole 12 penetrating the bottom wall 11 and projecting downward is provided in the center, Confirmation light fitting hole 13 leading into the recess 9
Is provided near the peripheral wall of the body 2, and a printed board support projection 14 is provided upright at an appropriate position in the recess 9. In addition, the surrounding wall 10 of the storage recess 9 is located at the center of the body 2,
A tension release table 15 is formed, and a mounting hole for the cord tension stopper 7 is provided.
The tapping screw 8 is screwed into the hole 16. Reference numeral 17 denotes a mounting boss, reference numeral 18 denotes a mounting screw hole, and reference numeral 19 denotes an electric wire penetration knockout portion.

A protector fitting groove 20 is provided on the lower surface of the body 2, and the protector 5 is detachably fitted thereto.

The printed board 3 is provided with a resistor 21, a confirmation light 22 and a lead wire 23 on the lower surface, a lead plate 24 on the upper surface, and a terminal insertion hole 25 provided with the printed board 3 on the lead plate 24. The resistor 21, the confirmation light, and the lead wire 23 are soldered to a lead plate 24.

The sensing unit 4 includes a heat-sensitive plate 26, a thermostat 27 and a pair of terminals 28. After fitting into the mounting hole 12 of the body 2, the terminal 28 is inserted into the terminal through hole 25 of the printed board 3.
Can be inserted and connected, and if necessary, the end 28a of the terminal 28 can be bent to make the connection sufficient.

In the above embodiment, when assembling the sensor 1, first, the sensing unit 4 is inserted and fitted into the body 2, and the protector 5 is inserted.
The printed circuit board 3 having the lead wire 23 and the like attached thereto is inserted into the housing recess 9 of the body 2, the terminal 28 is inserted into the terminal insertion hole 25, and the lead wire 23 is tightened with a tension stopper. 7
After fixing to the body 2 with the tapping screw 8,
The filling work 6 made of a synthetic resin, for example, urethane resin, is injected into the storage recess 9 and solidified, thereby completing the assembling operation.

When a urethane resin is used as the filler 6,
The time from injection into the storage recess 9 to curing is about 1 hour, 1/24 of the conventional adhesive and 1/30 of the filler (silicone resin), for a total of 53 hours. The time can be shortened to the extent. Further, since the protector 5 is fitted to the body 2 immediately after the sensing portion 4 is fitted to the body 2, damage and deformation of the heat sensitive plate 26 during assembly work can be prevented, workability is improved, and transport and storage are performed. At times, the thermal plate 26 can be protected.

This invention is not limited to the above embodiment,
Of course, other types of sensors may be employed.

(Effects of the Invention) As described above, this invention has a body attached to a construction surface such as a ceiling material, a sensing unit attached to the lower center of the body, and a lead wire connected to the housing formed inside the body. In a sensor comprising a printed board housed in a recess, the housing recess has a substantially cup-like shape with an upper opening, and a surrounding wall is provided from a central portion of the body to one side wall, and the lead wire is closer to the central portion than one side wall side. It is arranged to extend to the outside of the storage recess, and the terminals of the sensing unit are directly connected on the printed board, and a filling made of urethane resin is injected into the storage recess, and the lead wire in the storage recess is connected. Since it is individualized in a buried state, the number of parts can be reduced, the assembly workability is good, the time can be greatly reduced, and the watertightness in the storage recess of the printed board and the sensing part is perfect. Quality can be improved and cost can be reduced. Furthermore, since the urethane resin is used as the filler, the time from injection into the storage recess to curing can be about 1 hour,
The curing time can be significantly reduced as compared with the case where an adhesive or a silicone filler is used. Further, the urethane resin has a small change in physical properties even under conditions of high temperature and high humidity of 40 ° C. or higher where a fire detector is used, and has excellent adhesion to a body or an electronic component, and can improve waterproof performance. Furthermore, since the lead wire filled with urethane resin extends from the center of the body to one side wall, moisture transmitted through the lead wire is prevented from entering the printed circuit board, and the waterproof performance is further improved. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is a central longitudinal sectional view of the same, and FIG. 3 is an exploded perspective view of a conventional example. 1 ... detector, 2 ... body, 3 ... printed board, 4 ...
... sensing part, 6 ... filling, 9 ... storage recess, 23 ... lead wire, 24 ... lead plate, 25 ... terminal insertion hole, 28 ... terminal, a ... construction surface.

Claims (1)

(57) [Scope of request for utility model registration] 1. A body attached to a construction surface such as a ceiling material, a sensing unit attached to a lower center of the body, and a printed board connected to a lead wire and accommodated in an accommodation recess formed in the body. In the sensor, the storage recess has a substantially cup-like shape with an upper opening, and a surrounding wall is provided from the center of the body to one side wall, and the lead wire extends from the one side wall toward the center and is drawn out of the storage recess. The terminals of the sensing unit are directly connected on a printed board, and a filling made of urethane resin is injected into the storage recess, and the lead wires in the storage recess are singulated in an embedded state. And the detector.